Now that we can restart the extension host we should explore to enter multi-root workspace mode from 0 or 1 folder workspace without requiring a window reload.

This requires all users of the IWorkspaceContextService to be ready for the transition of zero or one folder into a workspace without window reload. The following larger components need to be adopted:

• Foundation (local storage, workspace, workspace editing, configuration, configuration editing) @sandy081 @bpasero
• Explorer @isidorn
• Task @dbaeumer
• Debug @isidorn
• Preferences @sandy081
• Search @roblourens
• Extensions (enablement, recommendations) @sandy081

Instead of statically checking for a workspace being present or not, these components should subscribe to the onDidChangeWorkspaceRoots event and handle all cases (0 folders, 1 folder, N folders).